enable this test too

svn path=/trunk/mcs/; revision=67486

mcs/class/Managed.Windows.Forms/Test/System.Windows.Forms/PictureBoxTest.cs

@@ -41,7 +41,6 @@ namespace MonoTests.System.Windows.Forms
 		}
 		
 		[Test]
-		[Category ("NotWorking")]
 		public void ImagePropertyTest ()
 		{
 			PictureBox myPicBox = new PictureBox ();